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Which of these applications historically favoured the dc drive?

  • A.Reversing rolling mills
  • B.Fixed-speed fans running continuously in one direction
  • C.Fixed-speed pumps delivering water into a constant head
  • D.Small hand tools operated intermittently from a single-phase supply

Answer: A

Wide speed range, four-quadrant capability and precise torque control were all available from a dc drive long before they were available from an ac one. Fixed-speed loads never needed anything more than a direct-connected induction machine.

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